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WiMAX TLV Format

This page covers wimax TLV encoding format. In wimax TLV formats are used for parameters in both mac management messages as well configuration file. TLV stands for Type, length and value. Size of type field will be always 1 byte. Size of length field is either 1 byte or more than 1 byte. Following rules apply for this. Size of value field depends on length field specified.

If the actual size of 'value' field is less than or equal to 127 bytes(length<=127) then

•  Size of 'length' field will be 1 byte
•  MSB of 'length' field is set to zero
•  The rest of 7 bits of length field indicates actual size of 'value' field in number of bytes.

EXAMPLE of this wimax TLV format: FEC code type for downlink burst
150(0x96), 0x01(msb:0),0x01(QPSK 1/2)

➨ Here first byte is type.

➨ As value is less than 127 length field in second byte is one byte with msb set to zero and its remaining 7 bytes indicates that size of value field is one(1).

➨The value field is mentioned as 0x01 representing as QPSK 1/2 modulation-code rate.

If the size of 'value' field is more than 127 bytes(>127) then

•  Size of length field shall be one byte more than what is actually used to mention size of 'value' field in bytes. •  MSB of first byte of 'length' field is set to one •  The remaining 7 bits of first byte of 'length' field indicates additional bytes of 'length' field •  The bytes other than first byte of 'length field' is used to mention size of the 'value field'.

EXAMPLE of this TLV format is Frequency(Uplink center) of value 2400000KHz (i.e. 2.4GHz) .

➨ Type= 5(0x5)
➨ Length= 0x83,0x00,0x00,0x03, in the first byte msb is set to 1 and remaining 7 bits of first byte indicate remaining bytes in the same length field i.e. 3 bytes here. Second, third and fourth byte together indicates size of value field here (i.e. actual frequency value).
➨ Value= 0x249F00



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Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
Bluetooth vs zigbee
Bluetooth vs zigbee
wibro vs mobile wimax
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FDMA vs TDMA vs CDMA
FDM vs TDM
CDMA vs GSM
OFDM vs OFDMA
wimax vs lte

Links to WiMAX MAC Layer resources

REG REQ and REG RSP
SBC REQ and SBC RSP
DSA REQ and DSA RSP
UCD,UIUC,DCD,DIUC
DLMAP and ULMAP
WiMAX Ranging Procedure
WiMAX Bandwidth Request procedure
WiMAX Network Entry Procedure
WiMAX CID vs SFID
WiMAX FCH header format
WiMAX TLV Format basics
WiMAX Timers
WiMAX Network Interface types
WiMAX QoS Classes

               

RF and Wireless Terminologies


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